Question

QUESTION 1 0.3 points Please fill in the names of the molecular building blods in the figure below

Answer 1

1) This is the structure of peptidoglycan.

A - N-acetylglucosamine

B - N-acetylmuramic acid

C - L-alanine

D - D-glutamine

E - L-lysine

F - D-alanine

2) Bacterial cells can contain additional genetic elements called plasmids.

3) Teichoic acids are only found in the cell walls of gram positive bacteria.

4) After gram staining, gram negative cells appear pink while gram positive cells appear purple.

Gram positive bacteria have a thick peptidoglycan cell wall and retain the crystal violet stain and appear purple. Gram negative bacteria have a thinner layer, so during the decolorization stage, they lose the crystal violet stain and then take up the counterstain safranin, hence they appear pink.

5) The two main classifications of bacteria based on the structures of their cell walls are gram positive bacteria and gram negative bacteria.